Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 67,878	$ 77,130
Accounts receivable, net of allowance for doubtful accounts of $148	7,134	5,516
Prepaid expenses and other current assets	2,603	2,631
Total current assets	77,615	85,277
Property and equipment, net	23,309	21,070
Restricted cash	530	530
Goodwill	52,848	52,848
Intangible assets, net	14,544	17,108
Other assets	1,143	1,217
Total assets	169,989	178,050
Current liabilities
Accounts payable	1,974	1,522
Accrued expenses	8,311	8,053
Deferred revenue, short-term	27,861	22,482
Notes and leases payable, short-term	783	842
Total current liabilities	38,929	32,899
Deferred revenue, long-term	3,287	3,349
Notes and leases payable, long-term	204	638
Other long-term liabilities	2,479	2,324
Total liabilities	44,899	39,210
Contingencies (Note 5)
Redeemable non‑controlling interest	0	355
Stockholders’ equity
Common stock, $.001 par value; 90,000 shares authorized; 26,038 and 25,247 shares issued and 25,379 and 24,785 shares outstanding at June 30, 2014 and December 31, 2013, respectively	25	25
Additional paid in capital	333,007	329,073
Treasury stock, at cost; 659 shares	(9,927)	(5,831)
Accumulated other comprehensive loss	(43)	(49)
Accumulated deficit	(197,972)	(184,733)
Total stockholders’ equity	125,090	138,485
Total liabilities, redeemable securities and stockholders’ equity	$ 169,989	$ 178,050